All good advice,
I have to interview Co-op/Interns a lot, most of the time my main goal is to figure out if they will be reliable, and not annoy anybody
I want good technical skills (I'm an IT guy) and some evidence they want to learn. 80% of the stuff I'd grill on is to make sure you fit in our team.
Problem solving, and general behavioral interviewing are the focus. There are books on behavioral interviewing skills worth a read. One of my favorite questions is what do you like to do? and What do you not like as well, IE would you prefer programming all day or hardware repair?
Read your own resume and make sure you can think of a sentence about each section to expand on the information. Take a couple spare copies with you, printed on good bond paper, sometimes its bonus points if they team interview and you can provide a spare copy for someone or just a nice easy to read copy.
Have fun...
Dave